wrong return value of function Map::isInLineOfSight

[gpn39f]

this function should return true, if the raytracer report free line of sight to the target object. but mostly returns the function a blocking line of sight . i found, if target objects standing upon a other object it returns nearly 100% a blocked sight.. it does for player, npc or bot.. testet NG core from 2014/06 upto 2016/02..